How to use collections.abc from both Python 3.8+ and Python 2.7 [duplicate]
This question already has an answer here:
Python 2 and Python 3 dual development
6 answers
In Python 3.3 "abstract base classes" in collections (like MutableMapping or MutableSequence) were moved to second-level module collections.abc. So in Python 3.3+ the real type is collections.abc.MutableMapping and so on. Documentation states that the old alias names (e.g. collections.MutableMapping) will be available up to Python 3.7 (currently the latest version), however in 3.8 these aliases will be removed.
Current version of Python 3.7 even produces a warning when you use the alias names:
./scripts/generateBoard.py:145: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated, and in 3.8 it will stop working
elif isinstance(value, (collections.MutableMapping, collections.MutableSequence)) == True:
In python 2.7 there is no collections.abc.
How can Python script handle this difference in the most convenient way, when it is meant to be used with (almost) any Python version? I'm looking for a solution which would ideally solve this mess in one central place, without having to use try: ... except: ... all over the script everywhere I need this type?
python python-3.x python-2.7
edited Dec 30 '18 at 16:18
JJJ
29.1k147591
asked Dec 30 '18 at 14:42
Freddie ChopinFreddie Chopin
4,7451439
marked as duplicate by jonrsharpe python
Users with the python badge can single-handedly close python questions as duplicates and reopen them as needed.
StackExchange.ready(function() {
if (StackExchange.options.isMobile) return;
$('.dupe-hammer-message-hover:not(.hover-bound)').each(function() {
var $hover = $(this).addClass('hover-bound'),
$msg = $hover.siblings('.dupe-hammer-message');
$hover.hover(
function() {
$hover.showInfoMessage('', {
messageElement: $msg.clone().show(),
transient: false,
position: { my: 'bottom left', at: 'top center', offsetTop: -7 },
dismissable: false,
relativeToBody: true
});
},
function() {
StackExchange.helpers.removeMessages();
}
);
});
});
Dec 30 '18 at 14:57
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
add a comment |
This question already has an answer here:
Python 2 and Python 3 dual development
6 answers
In Python 3.3 "abstract base classes" in collections (like MutableMapping or MutableSequence) were moved to second-level module collections.abc. So in Python 3.3+ the real type is collections.abc.MutableMapping and so on. Documentation states that the old alias names (e.g. collections.MutableMapping) will be available up to Python 3.7 (currently the latest version), however in 3.8 these aliases will be removed.
Current version of Python 3.7 even produces a warning when you use the alias names:
./scripts/generateBoard.py:145: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated, and in 3.8 it will stop working
elif isinstance(value, (collections.MutableMapping, collections.MutableSequence)) == True:
In python 2.7 there is no collections.abc.
How can Python script handle this difference in the most convenient way, when it is meant to be used with (almost) any Python version? I'm looking for a solution which would ideally solve this mess in one central place, without having to use try: ... except: ... all over the script everywhere I need this type?
python python-3.x python-2.7
edited Dec 30 '18 at 16:18
JJJ
29.1k147591
asked Dec 30 '18 at 14:42
Freddie ChopinFreddie Chopin
4,7451439
marked as duplicate by jonrsharpe python
Users with the python badge can single-handedly close python questions as duplicates and reopen them as needed.
StackExchange.ready(function() {
if (StackExchange.options.isMobile) return;
$('.dupe-hammer-message-hover:not(.hover-bound)').each(function() {
var $hover = $(this).addClass('hover-bound'),
$msg = $hover.siblings('.dupe-hammer-message');
$hover.hover(
function() {
$hover.showInfoMessage('', {
messageElement: $msg.clone().show(),
transient: false,
position: { my: 'bottom left', at: 'top center', offsetTop: -7 },
dismissable: false,
relativeToBody: true
});
},
function() {
StackExchange.helpers.removeMessages();
}
);
});
});
Dec 30 '18 at 14:57
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
add a comment |
This question already has an answer here:
Python 2 and Python 3 dual development
6 answers
In Python 3.3 "abstract base classes" in collections (like MutableMapping or MutableSequence) were moved to second-level module collections.abc. So in Python 3.3+ the real type is collections.abc.MutableMapping and so on. Documentation states that the old alias names (e.g. collections.MutableMapping) will be available up to Python 3.7 (currently the latest version), however in 3.8 these aliases will be removed.
Current version of Python 3.7 even produces a warning when you use the alias names:
./scripts/generateBoard.py:145: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated, and in 3.8 it will stop working
elif isinstance(value, (collections.MutableMapping, collections.MutableSequence)) == True:
In python 2.7 there is no collections.abc.
How can Python script handle this difference in the most convenient way, when it is meant to be used with (almost) any Python version? I'm looking for a solution which would ideally solve this mess in one central place, without having to use try: ... except: ... all over the script everywhere I need this type?
python python-3.x python-2.7
edited Dec 30 '18 at 16:18
JJJ
29.1k147591
asked Dec 30 '18 at 14:42
Freddie ChopinFreddie Chopin
4,7451439
This question already has an answer here:
Python 2 and Python 3 dual development
6 answers
In Python 3.3 "abstract base classes" in collections (like MutableMapping or MutableSequence) were moved to second-level module collections.abc. So in Python 3.3+ the real type is collections.abc.MutableMapping and so on. Documentation states that the old alias names (e.g. collections.MutableMapping) will be available up to Python 3.7 (currently the latest version), however in 3.8 these aliases will be removed.
Current version of Python 3.7 even produces a warning when you use the alias names:
./scripts/generateBoard.py:145: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated, and in 3.8 it will stop working
elif isinstance(value, (collections.MutableMapping, collections.MutableSequence)) == True:
In python 2.7 there is no collections.abc.
How can Python script handle this difference in the most convenient way, when it is meant to be used with (almost) any Python version? I'm looking for a solution which would ideally solve this mess in one central place, without having to use try: ... except: ... all over the script everywhere I need this type?
This question already has an answer here:
Python 2 and Python 3 dual development
6 answers
python python-3.x python-2.7
python python-3.x python-2.7
edited Dec 30 '18 at 16:18
JJJ
29.1k147591
asked Dec 30 '18 at 14:42
Freddie ChopinFreddie Chopin
4,7451439
edited Dec 30 '18 at 16:18
JJJ
29.1k147591
asked Dec 30 '18 at 14:42
Freddie ChopinFreddie Chopin
4,7451439
edited Dec 30 '18 at 16:18
JJJ
29.1k147591
edited Dec 30 '18 at 16:18
JJJ
29.1k147591
edited Dec 30 '18 at 16:18
JJJ
29.1k147591
29.1k147591
asked Dec 30 '18 at 14:42
Freddie ChopinFreddie Chopin
4,7451439
asked Dec 30 '18 at 14:42
Freddie ChopinFreddie Chopin
4,7451439
asked Dec 30 '18 at 14:42
Freddie ChopinFreddie Chopin
4,7451439
4,7451439
marked as duplicate by jonrsharpe python
Users with the python badge can single-handedly close python questions as duplicates and reopen them as needed.
StackExchange.ready(function() {
if (StackExchange.options.isMobile) return;
$('.dupe-hammer-message-hover:not(.hover-bound)').each(function() {
var $hover = $(this).addClass('hover-bound'),
$msg = $hover.siblings('.dupe-hammer-message');
$hover.hover(
function() {
$hover.showInfoMessage('', {
messageElement: $msg.clone().show(),
transient: false,
position: { my: 'bottom left', at: 'top center', offsetTop: -7 },
dismissable: false,
relativeToBody: true
});
},
function() {
StackExchange.helpers.removeMessages();
}
);
});
});
Dec 30 '18 at 14:57
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
marked as duplicate by jonrsharpe python
Users with the python badge can single-handedly close python questions as duplicates and reopen them as needed.
StackExchange.ready(function() {
if (StackExchange.options.isMobile) return;
$('.dupe-hammer-message-hover:not(.hover-bound)').each(function() {
var $hover = $(this).addClass('hover-bound'),
$msg = $hover.siblings('.dupe-hammer-message');
$hover.hover(
function() {
$hover.showInfoMessage('', {
messageElement: $msg.clone().show(),
transient: false,
position: { my: 'bottom left', at: 'top center', offsetTop: -7 },
dismissable: false,
relativeToBody: true
});
},
function() {
StackExchange.helpers.removeMessages();
}
);
});
});
Dec 30 '18 at 14:57
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
Place this at the top of the script:
import collections
try:
collectionsAbc = collections.abc
except AttributeError:
collectionsAbc = collections
Then change all prefixes of the abstract base types, e.g. change collections.abc.MutableMapping or collections.MutableMapping to collectionsAbc.MutableMapping.
answered Dec 30 '18 at 14:42
Freddie ChopinFreddie Chopin
4,7451439
add a comment |
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Place this at the top of the script:
import collections
try:
collectionsAbc = collections.abc
except AttributeError:
collectionsAbc = collections
Then change all prefixes of the abstract base types, e.g. change collections.abc.MutableMapping or collections.MutableMapping to collectionsAbc.MutableMapping.
answered Dec 30 '18 at 14:42
Freddie ChopinFreddie Chopin
4,7451439
add a comment |
Place this at the top of the script:
import collections
try:
collectionsAbc = collections.abc
except AttributeError:
collectionsAbc = collections
Then change all prefixes of the abstract base types, e.g. change collections.abc.MutableMapping or collections.MutableMapping to collectionsAbc.MutableMapping.
answered Dec 30 '18 at 14:42
Freddie ChopinFreddie Chopin
4,7451439
add a comment |
Place this at the top of the script:
import collections
try:
collectionsAbc = collections.abc
except AttributeError:
collectionsAbc = collections
Then change all prefixes of the abstract base types, e.g. change collections.abc.MutableMapping or collections.MutableMapping to collectionsAbc.MutableMapping.
answered Dec 30 '18 at 14:42
Freddie ChopinFreddie Chopin
4,7451439
Place this at the top of the script:
import collections
try:
collectionsAbc = collections.abc
except AttributeError:
collectionsAbc = collections
Then change all prefixes of the abstract base types, e.g. change collections.abc.MutableMapping or collections.MutableMapping to collectionsAbc.MutableMapping.
answered Dec 30 '18 at 14:42
Freddie ChopinFreddie Chopin
4,7451439
answered Dec 30 '18 at 14:42
Freddie ChopinFreddie Chopin
4,7451439
answered Dec 30 '18 at 14:42
Freddie ChopinFreddie Chopin
4,7451439
answered Dec 30 '18 at 14:42
Freddie ChopinFreddie Chopin
4,7451439
4,7451439
add a comment |
add a comment |
